An experimental tool is described for the investigation of the human control behavior for slow responding dynamic systems. The Program for Research on Operator Control in an Experimental Simulated Setting (PROCESS) is a simulation of a dynamic water-alcohol distillation system that can be used in research on operator training. In particular, PROCESS is designed to conduct research on fault management skills. PROCESS is described in detail, starting from a general model of control tasks; it enables the user to maintain the current status of more or less automatic systems or to change the state of the system. PROCESS is discussed from the perspectives of both the operator and the experimenter. The experimental configuration is then sketched, and ongoing research using PROCESS is reviewed. Recent research on control behavior for slow responding systems has suggested that training programs develop a set of fault management procedures to enable adequate control of the system. It is argued that, after sufficient practice, fault management procedures are cognitively represented as production rules that can yield quantitative predictors of performance. Information processing task analysis was used to determine the steps that build up fault management procedures. The focus of studies currently being conducted with PROCESS is the optimization of training programs for fault management skills, and the goal is the study of transfer of training. Six figures illustrate the PROCESS model. An appendix describes the equations governing PROCESS. (Author/SLD)